Blade Vortex loses all stacks when triggered

Current bugged action:
When using blade vortex in a Cast When Damage Taken support, upon casting 10 blades plus 1 more your stacks are reset to 1. Blade Vortex works as expected when self cast in the same exact build with only the CWDT gem taken out. (This is proved not to be a UI bug as its interaction with Blade Blast acts according to the stacks on the UI)

Expected action according to all EASILY available sources:
At 10 stacks, a cast of Blade Vortex removes the oldest existing active blade and replaces it with a new one thus leaving you with 10 stacks assuming you have leftover duration. This 'refresh' only happens of Blade Vortex cast from the same gem.

Effects of bug:
Stifles build creativity with Blade vortex 'cast on x' or any build using the Blade Blast interaction. If the bug is in effect on "cast on attack" such as on Poets Pen unique wand or Cast on Crit builds it is extremely damaging to the build creativity in Blade Blast.

Suggested change/fix:
If unintended, make CWDT refresh its own instance of Blade Vortex.
If intended, update in-game tooltip to indicate the game mechanic.

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Willing to capture video proof of interaction

Can confirm this is happening

REALLY ANNOYING!!!! It's messed up 2 of my builds (i'm a cwdt junkie so what!)

Can you please fix this, its preventing my build from playing the endgame